When in doubt, imagine that trough full of snow, ice and then some rain. The so-called builder has skewed the valley sideways to get some slope on it, maybe? The roof on the left shows a reverse slope, and the needles usually collect at a low spot or a drain. I don't believe that work was ever approved by an authority.
source https://www.inspectorsjournal.com/topic/18792-asphalt-shingles-in-open-valley/?do=findComment&comment=172007
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